Let's see, therefore, when one is used and when, instead, it is more correct to use the second verb tense.
Using the past perfect simple
The past perfect simple is used for:
- Expressing actions completed before a certain time in the past.
Example:
When I arrived, he had already eaten. → When I arrived, he had already eaten.
Here, "had eaten" indicates that the action of eating (completed) occurred before I arrived (another past tense: "I arrived").
- Highlight the result or completion of the action. In this case, we want to focus more on the result we achieved, rather than the moment the action occurred.
Example:
She had already written the report before the meeting started.
In this case, "had written" indicates that the action of writing the report was completed before the main action in the past ("the meeting started"). The use of the past perfect simple here emphasizes that the action of writing the report was already finished before the meeting began, emphasizing the completion of the action before another event in the past.
Use of the past perfect continuous
On the other hand, the past perfect continuous is used for:
- Emphasizing the duration or progress of an action up to a certain point in the past. In this case, it is often accompanied by text particles that suggest the duration of a period of time, namely "for" and "since." These are two similar prepositions of time , but they convey different information: for tells us how long an action lasted, while since tells us how long ago it began.
Example: The road was wet
because it had been raining for 7 hours.
"Had been raining" indicates that the rain (continuous action) had been continuing for several hours, until the road became wet. To use since, we could have said:
The road was wet because it had been raining since 8 AM. (And now it's 3:00 PM.)
- Highlight the period of time during which the action was in progress.
Example:
He was tired because he had been working all day. → He was tired because he had been working all day.
"Had been working" emphasizes the process of working (duration) up to a certain point in the past (until the end of the day). In this sentence, the focus is precisely on the fact that he had to work all day.